2&#39;,4&#39;-dihalogen-5&#39;-methyl-ortho-benzoyl-benzoic acid and process of making the same



Patented Apr. 30, 1929.

' UNITED STATES PATENT OFFICE.

ROGER ADAMS, OF UBBANA, ILLINOIS, ASSIGNOB TO THE NEWPORT COMPANY, 01 CARROLLVILLE, WISCONSIN, A CORPORATION OF DELAWARE 2',4armament-5'-iuETnYnoRTno-mmzoYL-mmom ACID AND PROGESSH or mme THE SAME. v

No Drawing.

This invention relates to 2,4'-dihalogen-5'- methyl-ortho-benzoyl-benzoic acid and to a process of making thesame.

It is an object of this invention to provide ortho-benzoyl-benzoic acid substitution products suitable for use as starting materials for intermediates in the manufacture of dyes and related chemicals and to provide a simple, efficient method for their production on a technical or commercial scale.

Other and further important objects of this invention will become apparent from the following description and appended claims.

I have now discovered that 2,4-di-halogenated-toluenes may be condensed with phthalic anhydride in the presence of a suit- I METHOD or PREPARATION.

benzoyZ-benzoz'a A mixture of parts of phthalic anhydride, 69 parts of 2-4'dichloro-toluene and 50 parts anhydrous aluminum chloride are warmed together foreight hours. The reaction mass is then decomposed in the usualway with hydrochloric acid and the excess dichloro-toluene distilled off with steam. After purification from toluene, the product 2,4' dichloro-5 methyl-ortho-benzoyl benzoic acid is obtained in the form of white crystals having a melting point of 140 C. Example; II. 2,4'-dibromo-5'methyl-orthobenzoyZ-benzoz'a acid.

I Same procedure as Example I'except using Application filed March 28; 1927. Serial No. 179,193.

able condensing agent, such as anhydrous aluminum chloride and anhydrous ferric chloride, to form the corresponding substituted ortho-benzoyl-benzoic-acids.

This reaction may be carried out with great ease and smoothness and' compounds suitable for use as starting materials for dyestuf'f intermediates thus, made technically available. The facility with which the reaction proceeds is contrar to what might be expected, since after con ensation there are four hydrogen atoms in the original benzene ring replaced by other groups.

The reaction is best expressed by the following chemical equation, wherein X represents a-halogen atom.

AlQl:

coon

toluene instead of 2,4 dichloro-toluene.

I am aware' that many changes may be made, and numerous details of the process may be varied through a wide range without departing from the principles of this invention, and I therefore do not purpose limiting the patent granted hereon, otherwise than necessitated by the prior' art.

I claim as my invention:

1. A process of preparing 2',4 -dihalo en- 5'-methyl-ortho-benzoyl-benzoic acid, w ich comprises condensing 2,4 dihalogen toluene with phthalic anhydride. 7

2. A process of preparing 2,4-dihalogen- 5'-methyl-ortho-benzoyl-benzoic acid, which comp'rises condensing 2,4 dihalogen toluene with phtha-Iic anhydride in the presence of anhydrous aluminum chloride as condensing agent.

3. A process of preparing 2',4.'v-dichloro-5'- 4. A process of preparing Q'Af-dihalogen- 6. As a new article of manufacture, 2,4'- -5'-methyl-0rtho-benzoyl-benzoic acid, which dichloro 5- methyl orth'o benzoyl henzoic comprises heating together phthalic anhyacid, having the following formula. 20 dride, 2,4-dihalo en toluene andanhydrous aluminum chlori e, decomposing the reaction mass vwith hydrochloric acid and distilling oil the excess dihalogen toluene.

5; As new articles of manufacture, Q'AJ- dihalogen 5 methyl ortho-henzoyl oen zoic 0 10 acids having the following formula, wherein Y X represents a halogen atom.

X V In testimony "whereof I have hereunto sub- 00 scribed my name at Urbana, .Ghampaign W 15 1 County, Illinois.

- 000K x- ROGER ADAMS. 

